What is the acceleration of free fall?

What is acceleration of free fall?

If a body moves on the circumference of a circle with a speed equal to that which it would acquire by falling freely through half the radius of the circle, prove that its centripetal acceleration is equal to the acceleration of the free fall.

If radius of the earth is 6347 km, then what will be difference between acceleration of free falls and acceleration due to gravity near the earth's surface?

Define free fall

What is free fall ?

What is free fall?